misfire when engine lugs

4 posts 3 contributors 1,224 views

Member since Aug 2012
3 posts
Meadow Lake , XX, Canada

Aug 12, 2012 at 7:12 PM

My 2000 crown vic has developed a miss fire when the engine lugs in overdrive or drive. in overdrive this usually happens between 70-90 kilometers per hours above this speed it run fine. Lots of power when and no mis fire when it shifts down for passing and no problems. any have this issue before?

kb2enj

Member since Jun 2011
21 posts
Maryville, TN, USA

Aug 12, 2012 at 9:11 PM

Yes, I have seen that problem a few times. First, if the car has over 80k miles, change the spark plugs with Motor Craft plugs. The original Motor Craft plugs do not last to 100k miles. Check the boots while you are changing the plugs, if they are soft or cracked, install new boots. Next if you still have that mis fire and no code; buy one Motor Craft coil and try it in each cylinder position. Good luck.

jdmeaux

Member since Jan 2009
525 posts
Lafayette, LA, USA
1 vehicle in the registry

Aug 13, 2012 at 6:24 AM

If no codes, you can do a tune up on the engine. The OEM plugs put in at the factory won't last the 100Km they claim.

*******************
PROUD MEMBER of www.crownvic.net

It's just a SUPER-DUTY Mustang GT Sedan. 198K miles and still rolling HARD.

1997 Crown Victoria P71 SVT *** ex-US Marshall service (the CAR)
STOCK?? I bet it was modified.

13.26 @ 107.24 MPH 1/4 mi w/ me, tools, & full tank of 93 octane

I added CAI, NICHE 19 X 8.5 " wheels with 245/45ZR 19 rubbers, and completely rebuilt the front end with poly bushings, Kooks headers, 2 1/4inch exhaust, TCI 2200-2400 rpm Stall converter

.PLANS:: engine upgrade, 5.4L 2v stroker, rebuild interior in leather w/ buckets, thinking about turbos

smokinjoedc51OP

Member since Aug 2012
3 posts
Meadow Lake , XX, Canada

Aug 17, 2012 at 4:33 PM

Ok thanks will try this

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